Hard-pen calligraphy is a wonderful flower in the hundred gardens of calligraphy art, and its writing tools include pens, ballpoint pens, dip pens, pencils, plastic pens, bamboo pens, wooden pens and iron pens. , with ink as the main carrier, showing China's writing skills. It has the characteristics of convenient carrying, quick writing and wide use value. The difference between it and the brush pen is that it changes the rough stippling of the soft pen into a slender stippling, and removes its tendons and bones.